The Kentucky Specks I have hatch like popcorn, nearly every kernal pops!!
Last year during the flood I lost every one I had sll the adult breeders as well as all the started chicks.   I had some eggs that were going on 3 weeks old that I was planning to pitch.  I ended up setting them in a friend's incubator and hatched several.  These chicks are my breeders for this year.   I've found them to be very active, very fertile.
Matt